Study sheet: Vertebrate Respiratory Systems

📋 Course Outline

1. Respiratory System Functions
2. Fish and Amphibian Respiration
3. Respiratory Systems of Amniotes

📖 1. Respiratory System Functions

🔑 Key Concepts & Definitions

• Vertebrate respiratory system : takes in oxygen (O₂) and eliminates carbon dioxide (CO₂).

📝 Essential Points

📌 The respiratory organs of vertebrates are adapted to the environment in which the animals live.

💡 Memory Hook

O₂ enters, CO₂ leaves

📖 2. Fish and Amphibian Respiration

📝 Essential Points

• Fish have gills located in the gill arches.

• Fish take in oxygen and release carbon dioxide through the gill lamellae.

📌 Amphibian larvae breathe with gills, whereas adult amphibians breathe through the skin or lungs.

💡 Memory Hook

Larval amphibians use gills; adults use skin or lungs

📖 3. Respiratory Systems of Amniotes

★ Must-know

📌 Amphibians, reptiles, birds, and mammals have lungs, whereas fish have gills.

• The respiratory passages consist of:

  • nostrils
  • larynx
  • trachea
  • bronchioles

• Birds have the most efficient respiratory system, assisted by air sacs.

Further detail

• In mammals, gas exchange takes place through the pulmonary alveoli, which enlarge the lung exchange surface.

💡 Memory Hook

Nostrils → larynx → trachea → bronchioles → lungs

📊 Synthesis Tables

Respiration among vertebrates

Group	Main respiratory organ	Specific feature
Fish	Gills	Gas exchange through gill lamellae
Amphibians	Gills, skin, or lungs	Larvae use gills; adults use skin or lungs
Reptiles, birds, and mammals	Lungs	Birds are assisted by air sacs; mammalian exchange occurs through alveoli